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Basically your lawn's shoots will match the lawn's roots. If you leave lawn long, over time, the roots will also lengthen, giving the grass plant more resilience and strength. However, "one time" scalping doesn't generally affect the roots, it's a cumulative effect. Generally accepted practice, though, at least in the northeast-for the last mowing, is to cut the lawn shorter than normal. (1.75" vs. 3" for example) Definitely not scalping as this can actually kill some of the plants and schock the lawn in general. Scalping would be ok for an aeration and overseeding or slice seeding, but that's the only time it's really used that I'm aware of.